Browsing by Author "Korkut S."

Now showing 1 - 2 of 2

An evaluation of properties of four heat treated wood species
(2014-01-01) Kesik H.I.; Korkut S.; Hiziroglu S.; Sevik H.
The objective of this work was to investigate the effect of heat treatment on swelling, hardness, and surface quality of four wood species, namely black locust (Robinia pseudoacacia L.), common alder (Alnus glutinosa L.), Western prickly juniper (Juniperus oxycedrus L.) and plum (Prunus domestica L.). Samples were exposed to temperature levels of 130 and 160. °C for 3 and 7. h. Surface quality and hardness of the specimens were determined using a stylus technique and Janka hardness, respectively. Based on the findings in this work overall dimensional stability of all four species improved with heat treatment. Surface quality of the samples was also enhanced due to heat exposure. Scanning electron micrographs revealed that some distortion and cell modification took place as a result of heat treatment. Furthermore, hardness of the samples was adversely influenced by the heat exposure. It appears that the properties of all samples exposed to a temperature of 160. °C for 7. h were more pronounced than those treated with a temperature of 130. °C for 3. h. © 2014 Elsevier B.V.
Optimizing lumber drying schedules for oriental beech and sessile oak using acoustic emission
(2020-08-01) Ünsal Ö.; Dündar T.; Görgün H.V.; Kaymakci A.; Korkut S.; As N.
The aim of this work was to detect sounds providing evidence of the creation of drying defects and to correlate such data with drying quality. A further goal was to establish sound wave thresholds of ideal drying through the drying process by using an acoustic emission (AE) monitoring method. Thus, it is projected to decrease long drying times and also drying costs by reaching to ideal drying schedules. In this study, commercially preferred sessile oak and oriental beech structural lumbers were dried with three different schedules in a conventional kiln. The lumbers were "listened to" with AE sensors while drying according to the first two schedules, which were called protective and severe, respectively. AE events of the drying experiments were compared with ambient conditions and drying classes according to the standard of European Drying Group. The third drying schedule was optimized based on the AE peaks and applied. The results showed that ideal drying times were reduced up to 19% relative to the protective drying schedule, while obtaining the same drying quality for both species.